Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
  • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
  • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
  • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
  • F04C18/0269—Details concerning the involute wraps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2250/00—Geometry
  • F04C2250/10—Geometry of the inlet or outlet
  • F04C2250/102—Geometry of the inlet or outlet of the outlet

Definitions

• This application relates to a scroll compressor having an inner wrap configuration wherein a swing radius is always equal to or greater than zero, and wherein the wrap is provided with a recess to increase the flow area through which the compression chambers and the discharge port communicate.
• a scroll compressor consists of a non-orbiting and an orbiting scroll each having interfitting wraps.
• the orbiting scroll moves relative to the non-orbiting scroll to move compression chambers towards a discharge port.
• scroll wraps were configured as relatively thin spiral wraps of a single thickness. More recently, scroll wraps of varying thickness having a shape generally defined by sequential segments of varying forms have been developed. These wraps may be generally described as "hybrid.”
• FIG. IA The general configuration of a scroll compressor can be seen in Figure IA.
• the scroll compressor 10 incorporates an orbiting scroll 12 and a non- orbiting scroll 14. These scroll members 12, 14 each have wraps.
• An inner end of three known scroll wraps is illustrated in Figures IB-ID.
• FIG. 1C Another known scroll compressor wrap inner tip wrap 30 is illustrated in Figure 1C. In this wrap, the swing radius begins at zero and remains equal to or greater than zero.
• FIG. 32 Yet another known style wrap inner tip is illustrated in Figure ID.
• This wrap 32 has its swing radius always being greater than zero.
• the thickness of the forward ledge 31 is greater than the thickness of the rear ledge 29 (A>B).
• FIG. 2 shows another prior art compressor type, which has been utilized only with the Figure IB configuration.
• a recess 40 is provided in the orbiting scroll wrap 28a to increase the flow area through which the compression chambers communicate with a discharge port 42.
• this feature has never been incorporated into the types of scroll wraps shown in Figure
• the present invention is directed to providing such a recess into the Figure 1C and Figure ID wrap configurations.
• scroll wraps having a swing radius that is always equal to or greater than zero are provided with a recess adjacent the tip of the scroll wrap.
• the recess does not extend through the entire height of the wrap, and serves to increase the flow area through which the discharge port communicates with the compression chambers.
• the recess may be provided with a supplemental recess in the non-orbiting scroll.
• This supplemental recess may extend through the entire length of the scroll wrap of the non-orbiting scroll, or may only be formed near the top surface opposite the base of the non-orbiting scroll.
• This recess in the non-orbiting scroll may actually extend through the base of the non-orbiting scroll and may serve to increase the overall cross-sectional area of the discharge port.
• At least one of the recesses may have multiple steps of differing heights. This will provide benefits as described below.
• Figure IA shows a prior art scroll compressor.
• Figure IB shows one wrap configuration of the prior art.
• Figure 1C shows yet another wrap configuration known in the prior art.
• Figure ID shows yet another wrap configuration known in the prior art.
• Figure IE graphically shows features of the wraps shown in Figures IB-ID.
• Figure 2 shows a prior art scroll wrap pair configuration.
• Figure 3 shows a first embodiment of the present invention.
• Figure 4 shows another embodiment of the present invention.
• Figure 5 shows another embodiment of the present invention.
• a wrap 50 is provided with a recess 52 adjacent an inner tip.
• the recess extends downwardly to a floor 54, such that the recess 52 has a height h that is less than an overall height of the wrap.
• This recess 52 is preferably formed in the orbiting scroll wrap.
• the wrap 50 may be configured as shown in Figure 1C or Figure ID. That is the wrap 50 may have a swing radius that begins at zero and increases, or that begins above zero and remains above zero. Stated another way, a forward ledge and a rear ledge may be equal, or the forward ledge may be greater than the rear ledge in the orbiting scroll wrap 50 that incorporates the recess 52.
• FIG. 4 shows another embodiment 55, wherein the discharge port 56 communicates with the recess 52.
• the wrap 50 would be somewhat obscuring flow through the port 56.
• FIG. 4 shows yet another embodiment 60, wherein the recess 62 in an orbiting scroll has steps 63 and 64.
• the steps provide benefits such as limiting the stress and reducing clearance volume that may occur to the wrap 60 by forming a recess through a single greater height. That is, by having a stepped recess with a lower height portion 64, the scroll wrap will have lower stress adjacent its innermost end and have smaller clearance volume, yet still have the increased exposure to the discharge port benefits as described above.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)

Applications Claiming Priority (2)

Publications (3)

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ID=37742713

Family Applications (1)

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Cited By (1)

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Citations (3)

Family Cites Families (16)

• 2005
  • 2005-08-09 US US11/200,364 patent/US20070036668A1/en not_active Abandoned
• 2006
  • 2006-06-26 EP EP06773951A patent/EP1913236B1/de not_active Expired - Fee Related
  • 2006-06-26 CN CN2006800285353A patent/CN101415906B/zh not_active Expired - Fee Related
  • 2006-06-26 WO PCT/US2006/024711 patent/WO2007021371A2/en active Search and Examination

Patent Citations (3)

Non-Patent Citations (1)

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